Update copyright year

Author: mnadareski

SabreTools.Serialization.csproj

@@ -13,7 +13,7 @@
     <!-- Package Properties -->
     <Authors>Matt Nadareski</Authors>
     <Description>Serialization and deserialization helpers for various types</Description>
-    <Copyright>Copyright (c) Matt Nadareski 2019-2023</Copyright>
+    <Copyright>Copyright (c) Matt Nadareski 2019-2024</Copyright>
     <PackageProjectUrl>https://github.com/SabreTools/</PackageProjectUrl>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <RepositoryUrl>https://github.com/SabreTools/SabreTools.Serialization</RepositoryUrl>